@mixin ber($top,$left,$right){
  border-top: $top;
  border-left: $left;
  border-right: $right;
}
@mixin pos($position,$top,$left){
  position: $position;
  top:$top;
  left: $left;
}

*{
  margin: 0;
  padding: 0;
}
.triangle_first{
  @include ber(80px solid orange,100px solid transparent,100px solid transparent);
  @include pos(absolute,150px,300px);
  display: inline-block;
}
.triangle_second{
  @include ber(90px solid orange,100px solid transparent,100px solid transparent);
  @include pos(absolute,150px,305px);
  transform: rotate(-69deg);
  display: inline-block;
}
.triangle_third{
  @include ber(90px solid orange,100px solid transparent,100px solid transparent);
  @include pos(absolute,150px,292px);
  transform: rotate(69deg);
  display: inline-block;
}